/Engine/Source/Runtime/Engine/Classes/Kismet/KismetRenderingLibrary.h
Set the inset shadow casting state of the given component and all its child attachments. Also choose if all attachments should be grouped for the inset shadow rendering. If enabled, one depth target will be shared for all attachments.
static void SetCastInsetShadowForAllAttachments ( [UPrimitiveComponent](API\Runtime\Engine\Components\UPrimitiveComponent) * PrimitiveComponent, bool bCastInsetShadow, bool bLightAttachmentsAsGroup )